I find this very interesting, but know very little about it. Hopefully one of our Shito-Ryu members can give more details and correct any misunderstandings?

I believe that the kata Aoyagi also goes by the name of Seiryu. In Tommy Morris’s 1982 book “Shukokai Karate Kata” (Shukokai having its roots in Shito-Ryu) when introducing Seiryu kata he states the following:

"Seiryu is an unusual kata, in that it has a slightly different variation for lady practitioners. The first three shiko-dachi stances and arm movements are omitted, and instead she steps forward into zenkutsu-dachi and performs an elbow strike with the palms of the hands facing each other. When the kata is performed by a man, there are a number of techniques performed with dynamic tension and deep breathing …."

In a discussion on this in the old forum (found HERE) this webpage was put forward as giving some background to the kata:

Can't say I know much about the kata in question but I can confirm that the names "aoyagi" and "seiryu" are in fact different ways of reading the same Chinese characters "??", which regardless of the reading have the meaning of "blue willow". I would also expect it to be able to be read as "aoyanagi" as well.

It did strike me as having a passing resemblance to a modernised version of the gojuryu kata "seiyunchin" though, sepecially the first line.